First-order theory for Earth’s inner-core anisotropy due to super-rotation and Ramachandran interaction
نویسندگان
چکیده
منابع مشابه
Inner-core Anisotropy and Rotation
■ Abstract This paper reviews recent research focused on the Earth’s inner core. Large inner-core traveltime anomalies and the anomalous splitting of core-sensitive free oscillations strongly suggest that the inner core is anisotropic. Initial models involved a simple, constant or depth-dependent cylindrical anisotropy at a level less than a few percent. Recent observations suggest that its eas...
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A recently assembled data set of inner core-sensitive free oscillation splitting measurements and body wave differential travel times provides constraints on the patterns of anisotropy in the Earth's inner core. Applying a formalism that allows departures from radial symmetry and cylindrical anisotropy results in models with P-wave velocity distributions whose strength and pattern are incompati...
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We investigate the attenuation structure of the Earth's inner core and its relationship to the velocity structure globally and along various sampling directions, by studying the amplitude ratios and the differential travel times of the PKiKP–PKIKP and PKPbc– PKIKP phases. Our observations reveal that the amplitude ratios of these core phases, like the differential travel times, vary in both sam...
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S U M M A R Y We report on more than 100 earthquake waveform doublets in five subduction zones, including an earthquake nest in Bucaramanga, Colombia. Each doublet is presumed to be a pair of earthquakes that repeat at essentially the same location. These doublets are important for studying earthquake physics, as well as temporal changes of the inner core. Particularly, our observation from one...
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Poupinet et al. [J. Geophys. Res. 89 (1984) 5719] presented a new methodology for testing whether the PKP travel times observed at College, Alaska station from South Sandwich Islands earthquakes indicate inner core rotation. They applied the method to seven events and concluded that there is no evidence for PKP(DF) times increasing systematically with event dates, and therefore no reason to pos...
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ژورنال
عنوان ژورنال: Journal of Earth System Science
سال: 2015
ISSN: 0253-4126,0973-774X
DOI: 10.1007/s12040-015-0568-7